Inductance coil



Patented Oct. 19, 1926.

UNITED. STA

EARLE M. CHASE, OF SERINGFIELD, MASSACHUSETTS.

INDUCTANCE COIL.

Application file d October 31, 1924. Serial No. 747,090.

This invention relates to an inductance coil designed for use in radio'apparatus and for other similar purposes. For such pur poses, a relatively thin or disc-like coilhas many advantages, both mechanically and electrically.

It is the general object of myinvention to provide a new and improved coil of the disc type which will have a very low distributed capacity and a highly concentrated magnetic field.

Another object of my invention is to provide a coil which may be easily and economically manufactured and one which will be strongly self-sustaining and in which successive layers or windings are so braced and associated that unusual mechanical strength and stiffness is obtained.

A still further object of my invention is to provide a coil which may be conveniently nested to form close-coupled pairs when such a construction is desired.

A further feature of my invention relates to the provision of a simple and highly practical support for one or more of my improved coils.

A preferred form of my invention is shown in the drawings in which Fig. 1 is a front elevation of my improved coil and the support therefor;

Fig. 2 is a side elevation of the parts shown in Fig. 1;

Fig. 3 is an enlarged detail view showing the method of winding my improved coil;

Fig. 4 is a diagrammatic view illustrating the arrangement Fig. 5 is a detail side View showing a close-coupled arrangement of coils.

Referring to the drawings, I have shown my improved coil in the form of an annular disc 10 having a substantially flat face at one side and having its opposite face formed in a succession of radially extended ridges or corrugations.

These coils are very conveniently formed by winding upon a form having a plurality or radially projecting spokes or arms which may be removed to release the coil after the coil is completed. In the manufacture of my improved coils, the windings are placed upon the spokes of the form and are then heavily coated with a suitable varnish or shellac by which the adjacent layers are firmly secured together to form a substantially rigid disc.

These discs may be supported in any conof successive layers; andvenient manner, but I have shown herein an lmproved support comprising a or angle 12 to which is secured a post or standard 13. The bracket 12 may be attached to any desired supporting surface 14 by screws 15 and may thus be secured at any desired angle, or in a vertical or horizontal position. The post 13 is preferably of an insulating or non-conducting material and extends through two of the smaller-recesses 16 (Fig. 5) formed in the winding of the coil. Suitable binding posts 17 may be provided on the post or standard 13 by which the desired connections to the coil may be easily made. If it is desired to support a second coil in spaced relation to the rst coil, a second post or standard 20 may be secured to the standard 13 by spacing studs 21 and the second coil 10 may be mounted on the post 20.

I will now describe the arrangement of windings in my improved coil. In the form shown in the drawings, each layer is formed of V-shaped sections 22 which sections are joined by intervenmg straight sections 23 vPreferably in winding the coil, each layer or winding passes at one side of a spoke or arm to form a V-shaped section and then passes on the opposite side of the next two successive arms. Preferably also the number of spokes is not a multiple of three so that the V-shaped sections in successive layers will be progressively advanced or retracted. In either case, the V-shaped sec.- tions of every third layer will be disposed in the same radial ridge or corrugation.

This arrangement of the windings is clearly indicated diagrammatically in Fig. 4, in which the top-most or nearest winding is indicated by the dark line 30, the next winding by the light line 31 and third winding by the broken line 32. If a fourth winding were shown it ing 30, the fifth winding with the winding 31 and so on through the coil.

The arrangement of the coils in Fig. l is diagrammatic only and in actual practice the successive layers cross each other substantially as shown in winding, however, passing over one spoke or arm and under the next two spokes or arms in the process of construction.

' While I have described an arrangement in which the windings are constructed in groups of three, I do not wish to be limited to this exact construction otherwise than as would co-incide with the wind- Figs. 2 or 5, each bracket IOU set forth in the claims, as for many purposes I may use groups containing either more or less than three layers in a group.

Reference to the drawings Will show that the layers of my improved coil cross and recross in such a manner that they are very securely braced against axial. displacement and that they form in effect a truss of very substantial strength. lVhen it'isd'esired to form a close-coupled double coil, two of my improved coils may be reversed and placed face-to-face, as indicated in Fig. 5, the ridges of each coilfittin-g closely into the depressions or indentations in the other coil.

My improved coils are commonly formed from a single continuous Wire but a double wire may obviously be substituted if desired, or alternate layers may be formed from two separate Wires. I

Having thus described my invention and the advantages thereof, I do not Wish to be limited to the details herein disclosed, other- Wise thanas set forth in the claims, but What I claim is 1. An inductance coil comprising a Wire ne0a515 structure Wound in radially successive layers to form a disc fiat on one side and ridged on the other, each layer comprising a plurality of V-shaped sections joined together by intervening substantially straight sections with the V-shaped sections in a certain layer and in every third layer therefrom radially aligned, said inductance coils being constructed to nest closely against eacho'ther in reversed position to form a double coil with the ridges of one coil disposed in the intervening depressions of the other coil, whereby a double coil of reduced axial length is produced.

2. A radio transformer comprising two spider Web Wound coils oppositely disposed and closely adjacent, each coil being formed of radially arranged layers of Wires with one flat surface and one radially ridged surface and the ridges of one coil fitting closely into the spaces between the ridges of the other coil. H

In testimony whereof I have hereunto atfixed my signature.

EARLE M. CHASE. 

